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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4a0e73f191d774b282cd845592f7b1e54389444b31ccffdad659ad20d4f3590' 
  AND token = 'J1IW1rUPCPlva3yX0tB+1BkqxLBC4zi6xj7JlxWoOeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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