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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34ebf5cc5b600b881d6271006d181184e802da97a6e55263cc1bdefdedae0f1b' 
  AND token = 'j0FGS6j6SET8vO+noGbPY5eWaO3A+CbNb3q7J5MTplQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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