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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c716d60e72e91d4cc7c10f879bc0f153e28894bd735576021558fbe8c11fea9' 
  AND token = 'ffDe6j9As0azFvU1cBaPT5lSQR1CshemgqUM2iZpd88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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