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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2717c940dbe9d30c5e9779ca1e9e0c5fafae6b2e1e9ecbbe1cfe7eb473460fed' 
  AND token = 'CbAonm+0qhvu6mBdsmTaQoxxxd4Ww8NA2QCPf/2EIng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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