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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '891baeae8ccac4882b0ff129a8956ceda8ca8b7a41e2ab0c7a970f3443dac47d' 
  AND token = 'ccTCGo1ojVMv2l6TJRTuUFmo54WQ/nM8naGcT/XK6zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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