SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5df2b92f0c30484cddc4d343ea05becb3cf5664ee59b67854baff626f9a07979' 
  AND token = 'KLR0wgzxLQOltBti/Q7vIVMi4r9MlbzGxLq6QFG8Gss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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