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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e77b36dfb1ae94a2f54c584d234c05f1d06e32a67d5e43f3d3c9ff000d00de4e' 
  AND token = 'pJy9W3ANzMz/ZaFbc9JHT+3NmwGkkSiD49YAo2Mdw6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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