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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e538e40446c6c0fc691fc0fa0f440384ae2d7a4a19fc9edec20f23e8cd95d030' 
  AND token = 'feBTRH0COj3fDe/yCtMFEU/h5pxt5d08npCQ+g1meiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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