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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f2bd772d2c1f9c57d0aadc23a4b640fedce3711f311ab92db42c9f6646bdf06' 
  AND token = 'BnQ4S/Xvos5fVlMR1OAVg1FcyyIYEIwBX6pNyeF3exM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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