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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '879fc46f2e1bb813baf0bb9107be3ed4b560d1ed323901a246dda428f3af15ab' 
  AND token = 'KV9tYT265xFemlZm6Im3D6U2LE+tQ2pdt0zIIe6liwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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