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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ecaaa340e5d27b0e3e1bb4868306c75c7585b02992426bd1bb39912e5544dac' 
  AND token = 'zOUe7pNRXTMJqrjbWq4J+jQjP1cwaxcDlnoVv+6xXRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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