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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d200899c6d9bec63baf32ed9a7851e86c212b058a8dedaef43f1d1b7197664f' 
  AND token = 'xQwzA+lD1BTARfaFbeeAyjlyQRGKSfDnyHK/6SG/fOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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