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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd984a0b781ea0f9fb307e2030aa962bc6b9c3d02b52037c2d95c2c79b293f479' 
  AND token = 'Wi/2hBYo/UKnU6meAKhI1UlhjRNYhkcAo6NCRC0vTJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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