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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26031e6925b792ae611b87bff7b50096e85a844c77780763be7b06ac9380e7ff' 
  AND token = 'd0vjfMbiTDqjzE0jqGfOCmP3Of6kUfhhqbKYorlN5lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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