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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e646851f7c16b3c28b9cb36824c69ffac0125d03122ac61d7328b1576a463000' 
  AND token = '8Edo/UV33Tzkv/31FgmJnd2dxEWRkqZO95y2G41uKzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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