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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9950dd177641069cd2c98fdd5b6b890dfd14bccea6d2c1d43683df45deecb51' 
  AND token = 'gnxJP8jXtjouLU11UrN+qPy5KpmIYtjxdVp4WQXjBjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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