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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4364484444e5b1a4a3d056e0be4c0061eebd3c6a3017e49e414f753e866b7fc4' 
  AND token = '6L2ca7/jSID/AECgb4jIslS62KTMTEomxIXPc9uo1sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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