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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41fd6b648e697caac081db6a01cb1b0824386cb34cc3a988631e00bd18f9bb5d' 
  AND token = 'V2AKDfiZumQJwmCot2lQWJzym0Tq8m2TnKVVZsSK0Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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