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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '467ccfdb4ac583feebbbad48b567bf8e9b3f698b46e5fdf6cdf97dc752d860e1' 
  AND token = 'dDKawoZ/IP179vjDJdlFsawmyrZ4TsryaRbxCQPbMFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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