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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bdcdac914b4a842de05bf3d878e669d81acdf77b06721b54ea8d25d73fa3746' 
  AND token = 'bCSTQWxo46wR3Xunv1p1zWd1a+4OW/KY6V73QKzSTjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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