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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc05e2b4843b06b58c64d2d547c64e68beed4ccd6a22a1fbe474eede78d18f02' 
  AND token = 'G2htov4vSGARrk7ORUYNhtlI2u+AaTFjYpp7TuHcV1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}