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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03433f283455e42c7aa49f6a950b935057bbee31883253b0f8e67f4f8c71fb5e' 
  AND token = 'Da7yxhq7NhBS80vQSXjlNOY6xN/UstUpSfWhko3+mX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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