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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8404c75c46566c3616d2513a088a67ec8628aab1a849ddc2099dd16e2b0f8ca' 
  AND token = '2/sHp1OfPKfmnmk7Ix66yTBn6IvUkLDENxUSlheI/QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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