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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c725bb4dcca7280ca8856852b72297f68e58d8c3b6fc944eb1abf450cf709ab' 
  AND token = 'CC63RXk//cMdR2F9kT3bwkOS5VoNHKO8aEFvm9V+lXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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