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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48c75aae1bbc8f2b561108cda1ac91873cd6226a47bbc58c47361f554fd564d' 
  AND token = 'kVYRbzLW5yzSzaegecg9lpl3ZXwUps7GCJ1qY3iVrnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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