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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a759fe798eaa3cab095185c0d183d0941403d65b7515fe933a670280723e0fb5' 
  AND token = 'C8Wn2izSPKUGaSMI/IdDO8yxXuqY6H4odF8anoWUYoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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