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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29a8e8ed6d94943b65212e9e392783948d0e7f1b5b6b3e9c2c6ac821de556f40' 
  AND token = 'x4SE3NLBBURv/lTroqKD69tpopDmiYd5NfPZge30NrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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