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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '350d43b650990bfb6fc0d933fee68e6d5b649e52b0aea4e1a64b8ea7aa0ccbde' 
  AND token = 'ec0PklGDc9mC29y/ORSU3RzLKKJmvd/0zQhmsZmsThI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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