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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84902ca76ec0381c41c8f7a3d0310456a4bde6a66e8e5af87dbf20af1d3a430d' 
  AND token = 'P5nmpfF5XqNPN3ZSuIWxnKEC1TpJ63O6HSC6u+X/mcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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