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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8f66605eb5a838af4a4a6dae0cd8bdbc1221ed143c6f5242c7dfc1fa1d58155' 
  AND token = 'p1RhW7nF3ZNfu+PhZtE0NrYTQg9TC2dFzWpRasrlvFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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