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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cb41b8f9fdf50d18e7f344708767901234cae10971515e5dd7d9d6a1586eb0b' 
  AND token = 'A454y6WIie0/TeJqWIffqB0cC9dFxPfFVKOB+Hb0u34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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