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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccc2de30c72d48bc106874ab83cdce31a7ddb51027895eeaaa08c69273b8e1bf' 
  AND token = 'nQEwvidpE6jFGUp2QyHjtelloS4gmB4bl5PFmW8CPok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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