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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb18a1aa4bdcaac30369cd0cf4278d310306be30f0a94992437c15c365aac8cd' 
  AND token = 'd3xWf+9ngJUsfbDQvL07OCKpE0oF/r/nPh6VbtfnPAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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