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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7b08bb4057275d5b73ed1c19e777c6fbda3c9177042896425b0281c91328f3f' 
  AND token = 'eUntF6MGWCe1IXsd5VRdStLLUFgybbaJKo0uBbn2XIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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