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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce8e9b7433f8ddc512d5ac565b53bd8a48351783904fc0180ce6470fe8bdefd7' 
  AND token = '3f8ip9KURMXpHNhIf+bt02Hp4E0i5NNJ3e7vjcr8vp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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