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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcfad9b4e444d35d276c824834b9a42d2dcc616f87187a01c5ec38ef2d9e1440' 
  AND token = 'D4RUYq+dqdzsxd0+jWOomSBvyBVqhU78TLs7asdy3V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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