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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d4ea010c0b8281fe8296130d82f70f0df9c0ffc228fe705916464ee3212607a' 
  AND token = '/az9Cwba5k+x/bxdpPxwj9J9dHFyZ462JENGQXeERis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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