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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e32aa393ef878811cd59fc9dffd01de1cbc0e239efbb02291763181eb0fb4c72' 
  AND token = '0r25JAZMnV94bQqy8MV5YnaH3jfVcnOC5gtj+K4by0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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