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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9959daec41104a0887d7a9c8bca04c7b8dc2929d8a8d1f9c90163edca1729ed7' 
  AND token = 'tESC6kWZcG6hQnhxfBAeh9ZKUzJY4IDaitmXPJnWIfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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