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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7472d6dd228de88d2b2647d19c6826f7ff44fc932d893fefb053934f0a03a616' 
  AND token = 'E1cfw94chAvE5hj6UFFVLPP3tIdWqoG2hWTFdX2pDyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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