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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '495c5ee092f64a5c5ba57ecfa3e817120afd3501e314532be954d5c4a0f4b417' 
  AND token = 'gj73tzgc3LAio5pGY5b7V2oxnNoI1YHbdR2nS39EFyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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