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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66635575ca782880e792ec1673777264a59a2e7ca6c8913a7b41572ea885ea8a' 
  AND token = '1By732UfWa6MWtPhZvu9bCz7STMH2pGf/AzO7QnDS8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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