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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65031d3f172f751521beb5e3d4b69ecb93ab1d4c76972540bf1325a3d8e10d25' 
  AND token = 'jr9zP3H2jPdOopYACQaziSSRkp0JRN/eUzNlKQ16yB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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