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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12de0dd96358bbcfd58f7f3d9371693938c7f1d81fb029466f126abdef04192d' 
  AND token = '/b4I7zEjAMnrxrX/RwSWQml3KJMjPmF9tpg2kas49gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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