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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c697543294962385d121055f53a987bcfba3cb0ba39486588d19b9f2a2afade' 
  AND token = 'MH9TU/tN00yzydvU3LJZD/yKDML1Jo58n6RtZYNE4xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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