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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e258ab1d0806e2ca88154f8121ac3e1efe07a275e41c9a9257603fbef8d91626' 
  AND token = 'ijlMwwN1Riw2atIcw0AJq6zN34+l1Dk0Z6vi3hQE3Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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