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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a9b6d48dc3ca8bd9cf90e0c78fe6831235089b551d0fa60eb4dea78f89396f' 
  AND token = 'WMkvxhCV+HDxAcfoMtJmPpdzdd2z8dWurNhQGLFAxYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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