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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'affef0b0220579163fea228a123e1ea16b9a6c94dad83d61eef9e27764fb4fbf' 
  AND token = '5Cdqjupgpyuh1oHClWe49vdqblMAJmO5GFBvdaAbyAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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