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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97ef604467493f6490874e4a88f454b3561479355db32b9ed05f75215ff72369' 
  AND token = '9XHQ4fwQWA+NNVX8yoeky2eReWSsRMmTa9SvdHtn2X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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