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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95188562ed9c6c3ee06a4fea220fde2558eec90f6b94a5336a34b7094eb75067' 
  AND token = 'AR5q2ZmXvZppgBbl3sRUbMSuUlxgv16m/AZwgwkrDc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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