SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06e2d43825ce94786afb2e58ca6305851821a90c0a8870f2797c70da5ec8616c' 
  AND token = '+XFgJvYS9uo5j/44iHXQ6zcew+Yht/RL7oEbVfaotXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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