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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebfe305def549095ec2ed106d6ce77b09d9ec5748abc6359a9004b1590124a47' 
  AND token = '5R8hSX1jxT7xNezYAhZM7wGC4eWahnt8Jwnis4VKN8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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