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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e7def8c016a6c208968c61ae877e6373aa3a2b6aa06d531e4e3a677f1b41d5b' 
  AND token = '89UyMnztd008LZF3FtTB7bwVpqBn01oFiEGGR1Rqd3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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