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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b569221af09036b0e4da1c686bf14feb55cbe4ec2d685fbe6c206f7f334484' 
  AND token = 'j963c4WF1DBllSNCu+ier94P1GTivGs/0vD14HqOEJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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