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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '331131d0f17ffb15c6dce2c908cf014be7289874d35c19383987da72eb7bb48f' 
  AND token = '+nt7ZouKN/eklc1Ild79olKVoVntw5virjEZIROE5NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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