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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbd16781258e015c7773771f19ae50d8542a2526dca5c6b4b85e50b3966575f8' 
  AND token = 'nu6qqco9p8OnW3gH7slxOOlC5L7XP6WJy5tVlNcgECM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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