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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abf6374cd48a4d9d08f11d4c7acc0bc1a068e0c226ea263cc183d9f5269c5e6b' 
  AND token = '1IUrQqaprLXY2uj2pdMs1EEcWIbJh1zTp6HHxWxQqSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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