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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91343f1b67985be7b120b744c9e72d3a4ad347f3a2b237f4652d3f1bafc467a3' 
  AND token = 'K3EJBooWs+ZJYoy9vA6DkKiCIZ2kDdCcbAe8TVjBuc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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