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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30d82f2f9b605bceba6d2e71007c76ecc59e7e6288dcac68286788e09fea7135' 
  AND token = 'kf4qSyjU/15zJ2dYO5MWDz0TToW1bzn+a3b4PMmnvTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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