SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d4db4dfbb610ec731109651d597eb281e7da4ff7034ba788b927fedb04adf58' 
  AND token = 'sYjgGYH3m9wIqSFlkgfpGlYuqr/WCV2gBOLmObe4nS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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