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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7597dc713b887bcc3d11bc8c594af515a16fbe510be31ccb8a56ab107636d51c' 
  AND token = 'ed0d7vS5TlzNi4S2PEdesa3RFxw0YcLmEQMu/Q8UngU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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