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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd258257ca1da5f450d5766273391ed7862f5314daa31a1777e471cb8b70635a2' 
  AND token = 'XS01ob4QAzGeeiGUKd8C5T//3fWHDL582eug9Om12ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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