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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7c03226a05d0d1823d62f5a3cc7f285f5c4f38ea3af8727b2710346f58417ed' 
  AND token = 'vCrXblk4JbTiYwmeewkXK0En7KcaAnJ/ZMCXeuKUk58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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