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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71ee5193ef5154de7e6e83357378eb2750a0ca8d5ced0d600b84cb8cbdc8d129' 
  AND token = 'q3rts0vEGRtg581aY9WfNDaFZBK9Ge/QXS3nsGelaW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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