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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88eb020bb12ee15edd7558d9c22bbc39d97e8875f9a030484d918b276c25fae6' 
  AND token = '8l3u8mfCY17bJ/7HzQiy7zp+BPgQ69TnaRaRYQPL0yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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